Everymeans______triedbutwithoutanyresult.
A.have beenB.is to beC.are to beD.has been在线课程D
解析:
此题考查时态和语态。句意:每种方法都试了,但是没有结果。由句意可知要用现在完成时态,强调对现在造成的影响。
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